import { asyncRoutes, constantRoutes } from '@/router'
import { generatorDynamicRouter } from '@/router/generator-routers'
import { getRouters } from "@/api/routers"
import Storage from 'vue-ls'

import Vue from "vue"
const options = {
  namespace: 'vuejs__', // key prefix
  name: 'ls', // name variable Vue.[ls] or this.[$ls],
  storage: 'local' // storage name session, local, memory
}

Vue.use(Storage, options)
/**
 * Use meta.role to determine if the current user has permission
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.includes(role))
  } else {
    return true
  }
}

/**
 * Filter asynchronous routing tables by recursion
 * @param routes asyncRoutes
 * @param roles
 */
export function filterAsyncRoutes(routes, roles) {
  const res = []

  routes.forEach(route => {
    const tmp = { ...route }
    if (hasPermission(roles, tmp)) {
      if (tmp.children) {
        tmp.children = filterAsyncRoutes(tmp.children, roles)
      }
      res.push(tmp)
    }
  })

  return res
}
const state = {
  routes:  constantRoutes,
  addRoutes: []
}

const mutations = {
  SET_ROUTES: (state, routes) => {
    state.addRoutes = routes
    state.routes = constantRoutes.concat(routes);
  }
}

const actions = {
  generateRoutes({ commit, dispatch }, roles) {
    return new Promise(async resolve => {

      let accessedRoutes = await dispatch('requestRouters', roles)
      commit('SET_ROUTES', accessedRoutes)
      resolve(accessedRoutes)
    })
  },
  async requestRouters({ commit, dispatch }, roles) {
    return await new Promise(async resolve => {
      return await getRouters().then(res => {
        if (res.data.length) {
          let routers = generatorDynamicRouter(res.data)
          resolve(filterAsyncRoutes(routers, roles))
        } else {
          resolve([])

        }

      })
    })

  },
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}
